A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

How can you tell a raw egg from a hard-boiled egg?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Can you place six X (crosses) in below board without making three in a row in any way ?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

What does this say?

XLR8

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?